Update to_do_app.py

Author: saqib777

To-do List/to_do_app.py

@@ -1 +1,132 @@
 
+"""
+To-Do List App
+--------------------
+A simple command-line Python app that lets you:
+1. Add new tasks
+2. View all tasks
+3. Mark tasks as completed
+4. Delete tasks
+5. Exit the app
+
+All tasks are stored in a local text file (tasks.txt) so that data persists between sessions.
+This is a beginner-friendly example of file handling, loops, and user interaction.
+"""
+
+# ---------- Import Section ----------
+import os  # Used to check if the file exists before reading/writing
+
+
+# ---------- Function Definitions ----------
+
+def load_tasks():
+    """Reads all tasks from the file and returns them as a list of dictionaries."""
+    tasks = []
+    if os.path.exists("tasks.txt"):
+        with open("tasks.txt", "r") as file:
+            for line in file:
+                # Each line has the format: task_name|completed_status
+                name, status = line.strip().split("|")
+                tasks.append({"name": name, "completed": status == "True"})
+    return tasks
+
+
+def save_tasks(tasks):
+    """Saves all tasks to the file so data is persistent."""
+    with open("tasks.txt", "w") as file:
+        for task in tasks:
+            file.write(f"{task['name']}|{task['completed']}\n")
+
+
+def show_tasks(tasks):
+    """Displays all tasks with their status."""
+    if not tasks:
+        print("\n✅ No tasks found. Start by adding one!\n")
+        return
+    print("\nYour To-Do List:")
+    print("-" * 30)
+    for i, task in enumerate(tasks, start=1):
+        status = "✔️" if task["completed"] else "❌"
+        print(f"{i}. {task['name']} [{status}]")
+    print("-" * 30)
+
+
+def add_task(tasks):
+    """Takes input from the user and adds a new task to the list."""
+    name = input("Enter new task: ").strip()
+    if name:
+        tasks.append({"name": name, "completed": False})
+        save_tasks(tasks)
+        print(f"✅ Task '{name}' added successfully!")
+    else:
+        print("⚠️ Task name cannot be empty!")
+
+
+def mark_task_completed(tasks):
+    """Marks a selected task as completed."""
+    show_tasks(tasks)
+    if not tasks:
+        return
+    try:
+        task_num = int(input("Enter the task number to mark completed: "))
+        if 1 <= task_num <= len(tasks):
+            tasks[task_num - 1]["completed"] = True
+            save_tasks(tasks)
+            print(f"🎉 Task '{tasks[task_num - 1]['name']}' marked as completed!")
+        else:
+            print("⚠️ Invalid task number.")
+    except ValueError:
+        print("⚠️ Please enter a valid number.")
+
+
+def delete_task(tasks):
+    """Deletes a selected task from the list."""
+    show_tasks(tasks)
+    if not tasks:
+        return
+    try:
+        task_num = int(input("Enter the task number to delete: "))
+        if 1 <= task_num <= len(tasks):
+            deleted = tasks.pop(task_num - 1)
+            save_tasks(tasks)
+            print(f"🗑️ Task '{deleted['name']}' deleted successfully!")
+        else:
+            print("⚠️ Invalid task number.")
+    except ValueError:
+        print("⚠️ Please enter a valid number.")
+
+
+def main():
+    """Main program loop that runs until the user exits."""
+    tasks = load_tasks()
+
+    while True:
+        print("""
+========= TO-DO LIST MENU =========
+1. View all tasks
+2. Add a new task
+3. Mark a task as completed
+4. Delete a task
+5. Exit
+===================================
+""")
+        choice = input("Enter your choice (1-5): ").strip()
+
+        if choice == "1":
+            show_tasks(tasks)
+        elif choice == "2":
+            add_task(tasks)
+        elif choice == "3":
+            mark_task_completed(tasks)
+        elif choice == "4":
+            delete_task(tasks)
+        elif choice == "5":
+            print("👋 Exiting To-Do List. Goodbye!")
+            break
+        else:
+            print("⚠️ Invalid choice. Please enter a number between 1 and 5.")
+
+
+# ---------- Run the App ----------
+if __name__ == "__main__":
+    main()